HOUSING (CHEMICAL FEED PUMP) MAINTENANCE.
Remove thumbscrew (15) and slug (16) from housing (5).
Remove stop pin (2) from housing (5).
To aid installation, count and record the number of turns required to
remove control knob. Mark position of knob on housing before removal.
Mark position of knob (1) on housing (5). While counting the number of turns, unscrew knob from housing.
Remove o-ring (4) from housing (5).
If broken, remove sight glass (7) from housing (5).